Lean burn internal combustion engine exhaust gas temperature control

a technology of internal combustion engine and control system, which is applied in the direction of electrical control, machine/engine, exhaust treatment electric control, etc., can solve the problems of relying on a conventional 3-way catalyst to meet emissions regulations, and the difficulty of maintaining adequate exhaust gas temperature in a lean burn engin

Active Publication Date: 2019-04-02
TULA TECH INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since compression ignition engines generally run lean, they cannot rely solely on a conventional 3-way catalyst to meet emissions regulations.
Maintaining adequate exhaust gas temperature in a lean burn engine is more difficult, since exhaust temperatures are reduced by excess air flowing through the engine.

Method used

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  • Lean burn internal combustion engine exhaust gas temperature control
  • Lean burn internal combustion engine exhaust gas temperature control
  • Lean burn internal combustion engine exhaust gas temperature control

Examples

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Embodiment Construction

[0022]The present invention relates to a skip fire engine control system for an internal combustion engine—and particularly, lean burn internal combustion engines. More specifically, the present invention relates to arrangements and methods for controlling exhaust gas temperature to improve efficacy of an emission control system. In various embodiments, the firing sequence is determined on a firing opportunity by firing opportunity basis or using a sigma delta, or equivalently a delta sigma, converter. Such a skip fire control system may be defined as dynamic skip fire control.

[0023]Skip fire engine control contemplates selectively skipping the firing of certain cylinders during selected firing opportunities. Thus, for example, a particular cylinder may be fired during one firing opportunity and then may be skipped during the next firing opportunity and then selectively skipped or fired during the next. This is contrasted with conventional variable displacement engine operation in w...

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PUM

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Abstract

A variety of methods and arrangements for controlling the exhaust gas temperature of a lean burn, skip fire controlled internal combustion engine are described. In one aspect, an engine controller includes an aftertreatment system monitor and a firing timing determination unit. The aftertreatment monitor obtains data relating to a temperature of one or more aftertreatment elements, such as a catalytic converter. Based at least partly on this data, the firing timing determination unit generates a firing sequence for operating the engine in a skip fire manner such that the temperature of the aftertreatment element is controlled within its effective operating range.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to U.S. Provisional Application No. 62 / 254,049, filed on Nov. 11, 2015, which is herein incorporated by reference in its entirety.FIELD OF THE INVENTION[0002]The present invention relates to a skip fire engine control system for an internal combustion engine. More specifically, the present invention relates to arrangements and methods for controlling exhaust gas temperature to improve efficacy of an emission control system.BACKGROUND[0003]Most vehicles in operation today are powered by internal combustion (IC) engines. Internal combustion engines typically have multiple cylinders or other working chambers where combustion occurs. The power generated by the engine depends on the amount of fuel and air that is delivered to each working chamber. The engine must be operated over a wide range of operating speeds and torque output loads to accommodate the needs of everyday driving.[0004]There are two basic types...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F01N3/20F02D41/00F01N3/08F01N3/021F01N11/00F01N13/00F02D41/40
CPCF01N3/2033F01N3/0814F01N3/2066F01N11/005F01N13/009F02D41/0087F02D41/401F01N3/021Y02T10/47F01N2430/08F01N2900/08F01N2900/1404F01N2900/1602F02D2041/0012F02D2200/0802F02D2200/0804Y02T10/24Y02T10/44Y02A50/20Y02T10/12Y02T10/40
Inventor YOUNKINS, MATTHEW A.CHEN, SHIKUI KEVINWILCUTTS, MARK A.
Owner TULA TECH INC
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